The present work starts with the study of the operation of the single-phase motors, their traditional starting techniques and the evolution of the electrical variables of voltage and current. The investigation continues with the theory of operation of the power inverters with PWM control and the possibility of using them in the optimization of the starting of a single-phase motor. Behavior of the single-phase motor is analyzed through simulations. Next, the for which two techniques are used with the help of the MATLAB/Simulink software: the first with traditional electromechanical circuits and the second with modulation of frequency and amplitude, being able to analyze current peaks presented in each of the cases. After the simulation, we proceed to the design of a PCB card with the help of ALTIUM designer software. The PCB card implemented, in conjunction with a microprocessor, will operate as a soft starter for the single- phase motor, replacing the electromechanical elements commonly used.